Tracking Down P0455 on Your 2022 Chevrolet Silverado
A P0455 on your 2022 Silverado means the ECM found a large EVAP leak. Your T1-platform Silverado—whether it's the 2.7L turbo, 5.3L V8, or 6.2L V8—may still be within GM's basic warranty. The gas cap is the first clue to check before visiting the dealer.
Symptoms
- Check engine light with P0455 (watch for P0449 companion)
- Faint fuel odor near the bed or filler neck
- Gas cap not clicking properly
- Failed emissions inspection
Causes by Likelihood
- Gas Cap Seal (Very High Likelihood): Loose or worn. Tighten or replace ($10–$25).
- Vent Valve Solenoid (Medium Likelihood): GM's vent solenoid near the charcoal canister failing. $100–$200.
- Purge Solenoid (Medium Likelihood): Stuck open or leaking. $80–$180.
- EVAP Vapor Line (Low Likelihood): Cracked line under the truck bed. $80–$200.
- Charcoal Canister (Low Likelihood): Saturated from overfilling. $200–$350.
Diagnostic Steps
Replace the gas cap with an OEM GM cap ($10–$25), clear the code, and drive 2–3 cycles. If P0455 returns, a GM dealer will run GDS diagnostics and a smoke test. Check for the companion P0449 code—if present, the vent valve solenoid is the likely cause.
Warranty Coverage
GM's basic warranty (3 years/36,000 miles) runs through 2025. The federal emissions warranty (8 years/80,000 miles) covers EVAP through 2030. Check with your dealer.
Safe to Drive?
Yes. P0455 doesn't affect the Silverado's engine, transmission, towing, or 4x4 capability.